bit meeting on rss (condensed version)

7/27/2019 Bit Meeting on RSS (Condensed Version)

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RSS Performance Analysis vs. BitSelection Brazil Operations

Luiz Marques

D&M - Brazil


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Introduction Project Objectives

n Analysis on RSS Performance vs. Bit employed onBrazil drilling operations


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Outline

n Introduction

n Performance Analysis

n Benefits

n Conclusions

n Recommendations


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Performance Analysis Data gathering

25

4

8

2

1

12

4

+18 exploration wells

n Campos Basin

n 8 Bit Runs


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Performance Analysis Bits overview

n RS163HDW

13mm cutters on face andgauge.

Impregnated sphericalcutters on gauge.

Short taper, mediumcone.

Gauge 2.0 in.

Face Volume 54.3 in3

n MRS74PX

16 mm and 13mm cutterson face.

13mm cutters on gauge.

13mm side cutters.

Short taper, shallow cone.Gauge - 2.5 in.

Face Volume 83 in3

n MRS741PX

16 mm and 13mm cutterson face.


13mm side cutters.

Short taper, shallow cone.Gauge - 2.5 in.

Face Volume 50.5 in3

n HCR506G12

16mm cutters on face.


Short taper, mediumcone.

Gauge 2.0 in.

Face Volume N/A


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Performance Analysis Field Overview

n Albacora Leste

Mainly marine turbidite depositional environment with

unconsolidated sandstones reservoir interbedded withcarbonate stringers and shales . Wells drilledhorizontally or directionally through reservoir forinvestigation, injection or production.


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Performance Analysis Method of Analysis

n RSS performance vs. bit selection Performance

Steerability DLS achieved per RSS setting

% time drilling per RSS setting ROP vs. DLS plot

Stability Stick-slip Shocks Wellbore quality


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Performance Analysis Method of Analysis

n Considerations Field / Formation

Well profile

BHA

Mud lubricity

Drilling events


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Performance Analysis Analysis ResultsPD675 Performance

n Average ROP (m/hr)

Best performance 55%higher than worstperformance.


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Performance Analysis Analysis ResultsPD675 Steerability

n DLS achieved per RSS setting


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n % time drilling per RSS setting

Less tool settingmeans less BUparts wear longer

runs with optimumperformance.


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n ROP vs. DLS plotGood performance withoutcompromising steerability

Poor performance and DLScapability constraints

Performance and steerabilityunpredictable due to bitaggressiveness


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Performance Analysis Analysis ResultsPD675 Stability


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2705 2755 2805 2855 2905 2955 3005 3055 3105 3155 3205 3255 3305

Measured Depth (m)

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ROP

GR_ARCINC

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P16H_UNC

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2 60 0 2 65 0 2 70 0 2 75 0 2 80 0 2 85 0 2 90 0 2 95 0 3 00 0 3 05 0 3 10 0 3 15 0 3 20 0 3 25 0 3 30 0 3 35 0 3 40 0 3 45 0 3 50 0 3 55 0 3 60 0 3 65 0 3 70 0 3 75 0

Measured Depth (m)

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Measured Depth (m)

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ROP

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P16H_UNC


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8 bit line

Over-gauge hole Hi stick-slipinside reservoir


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Conclusions8 1/2"

Bit Model Highlights Lowlights

RS163HDW Good performance while

drilling through clean, more

competent sands.

Very low performance drilling

shaly sticky formating, balling

up easily due to small cuttersize. Due to bit generated

BHA vibration, ROP is

dissipated in shales.

MRS74PX Good performance due to its

aggressive design. Very good

ability to drill through shales.

Performance drops drastically

when drilling through sands

and carbonates due to

amount of drilling energy

being dissipated into

vibration.

MRS741PX Good ability to drill through

shales and sticky formations.

Less aggressiveness from old

bit version resulted on better

energy transferring resulting

in faster ROP (less stick-slip).

ROP highly dependant on

formation. Lower performance

observed while drilling

through sandstone reservoir

and stringers.

HCR506G12 Good performance drilling

through different formations

resulting in a steady drilling

pace. Surface drilling energy

highly kept downhole.

Presents performance

reduction tendency while

drilling hard stringers.

Difficulty on drilling through

interbedded, competent

formation.

Performance (ROP)

Highlights Lowlights

Good DLS achievable in case

needed due to its design. In

low DLS wells can reduce BUseals wear (% setting)

because of its DLS capability

at low RSS settings.

Higher DLS only at high

percentage settings,

increasing BU wear. LowROP on shales reduce DLS

capability due to wellbore

washout.

Its aggressive design helps on

DLS achievement.

Bit aggressiveness DLS

capability wasted when

drilling sandstones and

stringers due to erratic

toolface and stick-slip related

wellbore wash-out (padssupport).

Its aggressive design helps on

DLS achievement.

Tendency to drill at high

percentage settings leading to

excessive wear on BU seals.

DLS reduced with reduced

aggressiveness. Erratic

toolface and wash-out

contributing to DLS capability

drop.

Good DLS ability at low

settings. Tendency to drill at

low RSS percentage settings.

Low level of stick-slip

contributes on DLS by

keeping steady toolface, and

ROP/stability result on higher

DLS.

Reduced DLS at very low

settings requiring aggressive

changes to be done on higher

settings, increasing BU wear.

Steerability

Highlights Lowlights

Stable while drilling through

consolidated sands, with low

stick-slip level.

Generates high vibration level

at shales, sticky,

unconsolidated formation.Surface drilling energy

(torque, RPM) dissipated into

BHA vibration.

Long gauge design reduces

hole spiraling tendency.

Very unstable with high levels

of stick-slip, specially drilling

through sands and stringers.

Wellbore quality deterioration

by bit vibration.

Long gauge design reduces

hole spiraling tendency.

High stick-slip generation due

to its aggressive design.

Problem worsening while

drilling through soft reservoir

sands. Wellbore quality

deterioration by bit vibration.

Very good stability on soft and

hard formations due to its

easy-steer design. Problems

easily corrected through

drilling practices showing

good bit versatility.

Low drilling performance on

hard stringers tends to create

instability on thin intercalated

formations.

Stability

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